ip6_gre: Fix MTU setting for ip6gretap
authorHaishuang Yan <yanhaishuang@cmss.chinamobile.com>
Sat, 21 May 2016 10:17:34 +0000 (18:17 +0800)
committerDavid S. Miller <davem@davemloft.net>
Tue, 24 May 2016 21:33:48 +0000 (14:33 -0700)
commit1b227e536662eae4b7beee3037edbecdc577495f
tree63e240aac0a2198bb5f16014c2f91b0edd0ae56f
parent54b9430f04b0be3beb7f2711152c61e7d39c58e5
ip6_gre: Fix MTU setting for ip6gretap

When creat an ip6gretap interface with an unreachable route,
the MTU is about 14 bytes larger than what was needed.

If the remote address is reachable:
ping6 2001:0:130::1 -c 2
PING 2001:0:130::1(2001:0:130::1) 56 data bytes
64 bytes from 2001:0:130::1: icmp_seq=1 ttl=64 time=1.46 ms
64 bytes from 2001:0:130::1: icmp_seq=2 ttl=64 time=81.1 ms

Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv6/ip6_gre.c
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